'The end of the human race'. On the list of doomsday scenarios that could wipe out the human race, super-smart killer robots rate pretty high in the public consciousness.
All stars live by fusing hydrogen into helium. In the first step of the process, two hydrogen atoms fuse to form deuterium. In the next step, another hydrogen atom fuses with the deuterium, creating a rare isotope of helium that has two protons and one neutron in its nucleus. In the third step, two of the rare helium atoms fuse to create a single normal helium atom and two hydrogen atoms. The fusion pathway described above requires six hydrogen atoms to create one helium atomâhowever, there are two hydrogen atoms left over at the end of the process. The net result is that it takes four hydrogen atoms to make one helium atom.
Telophase is the final stage of mitosis, or the process by which cells divide. Mitosis consists of five phases - prophase, prometaphase, metaphase, anaphase, and telophase. During telophase, the nuclei for the daughter cells finally form and the cell begins to split into two. Meiosis is the process that leads to the formation of sperm cells and egg cells. The same five phases that are in mitosis occur twice during meiosis.